RADIO'S GREATEST MAGAZINE APRIL 25 Cents Over 200 Illustrations ccF BROADCAST ti e WRNYSTATION GERNSBACK WEIGHING IN RADIO STATIONS SEE PAGE 1122 72n 1't) www.americanradiohistory.com III. CUNNINGHAM r - 'i "'Á DID 1 ITIÚ BES i I III '`I_ I I1L: I. The Vacuum Tube of Today remains the most sensitive device in the radio world. During the past year it has reached new heights of performance in making A C reception possible. Cunningham Radio Tubes have pioneered and blazed the way for each progressive stet. and maintained their high standard of quality from the earliest days of the industry. E. T. CUNNINGHAM, INC. NEW YORK CHICAGO Si.N FRANCISCO www.americanradiohistory.com Radio News for April, 1928 1089 VADM7Z°°. nYueare& jrOINING the Radio Association enables you to cash Doubled Income in Six Months in on Radio now! Follow its success -proven plans "I attribute my success entirely to the Radio Associa- and you can earn $3 an hour, in your spare time, tion," writes W. E. Thon, Chicago, who was clerk-in a from the very first. Over $600,000,000 is being spent hardware store before joining. We helped him 4cure yearly for sets, supplies, service. You the managership of a large std re at can get your share of this business a 220% increased salary. and,tt the same time, fit yourself for the big -pay opportunities in Radio. What a Membership Can "In 1922 I was a clerk," writes K. O. Do for You Benzing, McGregor, Ia., "when I enrolled. Founded on a New Idea Since then I have built hundreds of sets- I- Enable you to earn $3 an hour from 1 -tube Regenerative to Supefhetero- Members of the Association do not upwards in your spare time. d ynes. I am now operating my o .i store wait for months before they make and my income is 200% greater thin when 2 -Train you to install, repair and I joined the Association. My entire success money out of Radio. Without quit- build all kinds of sets. is due to the splendid help it gave." ting their jobs. our members are 3 -Start you in business without earnin5 $25 to $75 a week spare time capital, or finance an invention. Easiest Way Into Radio by building "tailored" radio sets, 1 -Train you for the $3,000 to If ambitious to become a Radio;Engineer, serving as "radio doctors," selling $10,000 big -pay radio positions. to fit yourself for the $3,000 #o $10,000 ready built sets and accessories, or opportunities in Radio, the 5 -Help secure a join ssociation. better position It a following one of the many profit - at bigger pay for you. gives you comprehensive, practical and making plans of the Association. theoretical training and the be fit of our 6 -Give you the backing of the Employment Service. You ear while you Radio Association. Earned $500 in Spare Hours learn. You have the privileg of buying A MEMBERSHIP NEED NOT radio supplies at wholesale. u have the Association behind you in carrying out your Hundreds earn $3 an hour as "radio COST YOU A SINGLE CENT doctors." Lyle Follick, Lansing, ambitions. Mich., has already made $500 in spare ACT NOW you wish Special time. Werner Eichler, Rochester, -if N. Y., is earning $50 a week for spare time. F. J. Membership Ilan Buckley, Sedalia, Mo., is earning as much in spare To a limited number of ambitious men, we will give Special time as he receives from his employer. Memberships that may not -need not -cost you a cent. To secure one, write today. We will send you details and also We will start you in business. Our cooperative plan our book, "Your Opportunity in the Radio Industry." It will -given the ambitious man his opportunity to establish open your eyes to the money -making possibilities of Radio. himself. Many have followed this plan and es- Write today. tablished radio stores. Membership in the Association has increased the salaries of many. Scores are now r connected with big radio organizations. Others have RADIO ASSOCIATION OF AMERICA, prosperous stores. 4513 Ravenswood Ave., Chicago, III. Dept. RN -4 A year ago Claude De Grave knew nothing about Radio. Gentlemen: Today he is on the staff of a famous radio manufac- Please send me by return mail full details of your Special Membership Plan and also copy of your book, "Your Oppor- turer and an associate member of the Institute of Radio tunity in the Radio Industry." Engineers. He attributes his success to joining the As- sociation. His income now is 350% more than when Name he joined. Address City State www.americanradiohistory.com 1090 Radio News for April, 1928 \ \ \ i/ Published by EXPERIMENTER PUBLISHING COMPANY, Inc., Publishers of "Radio News," "Science and Invention,' "Radio Listeners' Guide," "Amazing Stories" and "French Humor." H. GERNSBACK, President S. GERNSBACK, Treasurer C. E. ROSENFELT, Secretary Member: Audit Bureau of Circulations Radio Magazine Publishers Association Editorial and General Offices . 230 Fifth Avenue, New York City VOLUME 9 APRIL, 1928 NUMBER 10 Contents of This Issue: Radio News' New Policy .1 Novel Alitonlatie Volume Control By Hugo Gernsback 1097 By Harold A. Wheeler 1181 Television Comes to the Home, A Really Portable Radio Set, By G. C. B. Rowe 1098 By J. B. Armstrong 1132 Home Radio Photography 1101 What Constitutes Tone Quality (Part II), The Listener Speaks 1104 By Robert Neil Auble 1134 Favorite Broadcast Artists 1105 Controlling Volume in Your Receiver, When the "SOS" Flashes! By John B. Brennan, Jr. 1136 By Orrin E. Dunlap 1108 How Powerful a Tube Does Your Set The Old Dray Mare, Need 1137 By Robert Francis Smith 1110 The Action of "B" Socket -Power Units, Broadcastatics 1112 By Herndon Green 1138 Dr. de Forest Talks on Real" 1113 How to fick an Audio Amplifier, By Fred H, Canfield 1140 The Newest in Radio Equipment 1114 Radio in Every Hotel Room 1115 Transmitting on a Wavelength of Three The Radio School Teacher is Here, Quarters of a Meter, By Armstrong Perry 1116 By H. E. Hohmann, 1143 What's New in Radio 1118 Letters from Home Radio Set 000 Monthly Prize for Set Builders 1119 Constructors 1146 'When Radio Turns Street Lamplighter RADIO NEWS LABORATORIES 1148 By S. R. Winters 1120 Iladiotics 1150 List of Broadcast Stations 1121 I Want to Know, - By C. W. Palmer 1151 "Weighing In" Radio Stations, Why Batteries are Still in Fashion for By A Binneweg, Jr. 1122 Short -Wave Receivers 1158 Whispering Across the Hudson River, Some Suggestions About Resistance By Joseph Riley 1123 Coupling 1170 The Radio Beginner -What a Radio Tube Radio "Bugs" 1172 is and What it Does, Short -Wave Broadcast Information, By Clyde A. Randon 1124 By E. T. Somerset 1174 An IL-I?. Short -Wave Broadcast Receiver Short -Wave Data Wanted 1175 ($100 Prize Winner) What the Federal Radio Commission By W. Francis Goodrean 1126 Needs 118i In Forthcoming issues: THE "R.F. BOOSTER UNIT" COMING-A PROGRAM POOL? HOW BROADCASTING IS ACCOMPLISHED By David Grimes By Charles Magee Adams By G. C. B. Rowe Titis well -known radio engineer has designed There remains now hardly an unsolved prob- The workings of the radio receiver are well a novel instrument for use with any radio lem in the technique of radio broadcasting known to most readers, and the broadcast receiver to increase range and selectivity. It except this little one -fete shall bear the studio shows little that is mysterious. This crut he plugged in or out as receiving con- expense? Mr. Adams' comments will inter- article explains in simple language the ditions vary. est every listener. laborious processes that lie between. RADIO NEWS is published on the 10th of each preceding month. There are 12 RADIO NI':Ws is for sale at all newsstands in the United States is $2.50 a year in U. S. and possessions. and Canada, numbers per year. Subs.-rinllon price and at ltrentann's, Arc. de LOpen. l'arts, France. European agents: S. J. Canada and foreign countries, $3.00 per year. U. S. Coin as well as U. S. 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